1. Renal Division, Department of Medicine, Peking University First Hospital, Beijing, People’s Republic of China
2. Institute of Nephrology, Peking University, Beijing, People’s Republic of China
3. Key Laboratory of Renal Disease, Ministry of Health of China, Beijing, People’s Republic of China
4. Department of Clinical Laboratory, Peking University First Hospital, Peking University First Hospital, Beijing, People’s Republic of China